Try MPFR!

Precision(in bits): 64 <= <= 8192

Formula: pi + exp(1.0)

All of special functions (sqrt, exp, log, log10, log2, sin, cos, tan, sec, csc, cot,sinh, cosh, tanh, sech, csch, coth, acos, asin, atan, asinh, acosh, atanh, expm1,
floor, ceil, gamma,lngamma, zeta, erf, erfc, eint),
constants (pi, eu(Euler's Constant), ca(Catalan's Constant), Normal Float(ex. 2.3e+1)),
and arithmetic(+, -, *, /, ^) are available.